Обсуждение: pgsql: Try again to make the visibility map crash safe.

Try again to make the visibility map crash safe.

My previous attempt was quite a bit less than half-baked with respect to
heap_update().

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e16954f3d27fa8e16c379ff6623ae18d6250a39c

Modified Files
--------------
src/backend/access/heap/heapam.c |   45 ++++++++---------
src/backend/access/heap/hio.c    |   97 ++++++++++++++++++++++++++++++-------
src/include/access/hio.h         |    2 +-
3 files changed, 100 insertions(+), 44 deletions(-)